Compilare: main.cpp: In function 'void itera(Nod*, std::__cxx11::string, int)': main.cpp:59:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i==s.length()-1) ~^~~~~~~~~~~~~~ main.cpp: In function 'void Op1(std::__cxx11::string)': main.cpp:75:10: warning: unused variable 'Iter' [-Wunused-variable] Nod *Iter=root; ^~~~ main.cpp: In function 'int main()': main.cpp:119:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("triw.in","r",stdin); ^ main.cpp:120:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("trie.out","w",stdout); ^ main.cpp:128:27: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%c",&c); ^